E-fuse Structure With Dummy Metal Plug For Faster Programming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing e-fuse structures in semiconductor devices face challenges in efficiently programming due to uniform temperature and electrical driving forces, which affect the formation of voids and resistance changes, limiting their programming speed and efficiency.
Innovation Solution
The e-fuse structure incorporates a dummy metal plug with a barrier metal layer, made of a second metal material with lower conductivity than the fuse link, which alters the temperature gradient and electro-migration driving forces, creating a non-uniform total driving force to enhance programming efficiency and reduce operation voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional e-fuse structure with uniform metal material is used, then the structure is simple and easy to manufacture, but the programming speed is slow and efficiency is limited due to uniform temperature and electrical driving forces
Solution Approach 1:
The fuse link is divided into multiple regions with different metal materials (first metal material in first region, second metal material in second region) to create non-uniform electrical conductivity and temperature distribution. This local differentiation of material properties generates non-uniform total driving force, accelerating void formation in specific regions and improving programming speed without significantly increasing overall structural complexity
Solution Approach 2:
The e-fuse structure employs composite metal materials with different electrical conductivities (first metal material and second metal material) within the fuse link. This composite approach creates intentional non-uniformity in electrical and thermal properties, generating enhanced total driving force (electrical + thermal) that speeds up the programming process while maintaining a relatively simple overall structure
2Speed
If high programming current is applied to achieve faster void formation, then programming speed increases, but the required operation voltage increases and manufacturing yield decreases
Solution Approach 1:
The invention changes the electrical conductivity parameter along the fuse link by using different metal materials in different regions. This parameter variation creates non-uniform current density and Joule heating distribution, generating enhanced total driving force that accelerates void formation at lower operating voltages, thereby improving programming speed without increasing energy consumption
Solution Approach 2:
The invention replaces the reliance on high electrical current (electrical force only) with a combined approach utilizing both electrical driving force and thermal driving force. The non-uniform temperature distribution generated by the composite metal structure creates thermal gradients that supplement the electrical driving force, enabling faster programming at reduced voltage levels
3Productivity
If the fuse link has uniform electrical conductivity, then the manufacturing process is simplified, but the total driving force remains uniform resulting in slow void formation and limited programming efficiency
Solution Approach 1:
The fuse link employs local quality variation by incorporating different metal materials (first metal material with first electrical conductivity, second metal material with second electrical conductivity) in different regions. This creates intentional non-uniformity in electrical conductivity and thermal properties, generating non-uniform total driving force that concentrates void formation in specific regions, thereby improving programming efficiency while maintaining controlled material composition
Solution Approach 2:
The invention uses composite metal materials with deliberately different electrical conductivities to create non-uniform electrical and thermal characteristics along the fuse link. This composite structure generates enhanced and non-uniform total driving force (combination of electrical and thermal driving forces), significantly improving programming efficiency while the material composition remains stable and controllable through standard semiconductor manufacturing processes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for faster programming of the e-fuse structure by increasing the total driving force, leading to quicker void formation and improved resistance changes, enabling reduced programming voltage and enhanced manufacturing yield.
Implementation Method 1
the dummy metal plug changes a temperature gradient in the fuse link when the fuse link carries the program current
Implementation Method 2
a first electrical driving force caused by electro-migration at the first region of the fuse link may be different from a second electrical driving force caused by electro-migration at the second region of the fuse link
Implementation Method 3
the dummy metal plug changes a temperature gradient in the fuse link when the fuse link carries the program current
Data Source
AI summary
Provided is an e-fuse structure of a semiconductor device. the e-fuse structure may include a fuse link formed of a first metal material to connect a cathode with an anode, a capping dielectric covering a top surface of the fuse link, and a dummy metal plug penetrating the capping dielectric and being in contact with a portion of the fuse link. The dummy metal plug may include a metal layer and a barrier metal layer interposed between the metal layer and the fuse link. The barrier metal layer may be formed of a second metal material different from the first metal material.